Modal transformation obtained from Clarke's matrix - Asymmetrical three-phase case

Some constant matrices can be used as phase-mode transformation matrices for transposed three-phase transmission lines. Clarke's matrix is one of these options. Its application as a phase-mode transformation matrix for untransposed three-phase transmission lines has been analyzed through error and frequency scan comparisons. Based on an actual untransposed asymmetrical three-phase transmission line example, a correction procedure is applied searching for better results from the Clarke's matrix applicaton as a phase-mode transformation matrix. The error analyses are carried out using Clarke's matrix and the new transformation matrices obtained from the correction procedure. Applying Clarke's matrix, the relative errors of the eigenvalue matrix elements can be considered negligible and the relative values of the off-diagonal elements are significant. If the the corrected transformation matrices are used, the relative values of the off-diagonal elements are decreased. Based on the results of these analyses, the homopolar mode is more sensitive to the frequency influence than the two other modes related to three-phase lines. © 2007 IEEE.

Education and knowledge: basic pillars of changing production patterns with social equity

Includes bibliography

Strengthening development: the interplay of macro- and microeconomics

Includes bibliography

La transformation productive 20 ans aprés: problémes anciens, nouvelles opportunités. Synthése

Incluye Bibliografía

The transformation of the North American apparel industry: is NAFTA a curse or a blessing?

Includes bibliography

Export performance, technological upgrading and foreign direct investment strategies in the Asian newly industrializing economies: with special reference to Singapur

Includes bibliography

Structural reforms, technological gaps and economic development: a Latin American perspective

Includes bibliography

Science and technology policies in open economies: the case of Latin America and the Caribbean

Includes bibliography

Restructuring in manufacturing: case studies in Chile, Mexico and Venezuela

Includes bibliography

Development of technological capabilities in an extremely volatile economy. The industrial sector in Argentina

Includes bibliography

Technological evaluation of biotechnology capability in Amazon institutions

Includes bibliography

Representation of transmission lines in modal domain using analytical transformation matrices

The phases of a transmission line are tightly coupled due to mutual impedances and admittances of the line. One way to accomplish the calculations of currents and voltages in multi-phase lines consists in representing them in modal domain, where its n coupled phases are represented by their n propagation modes. The separation line in their modes of propagation is through the use of a modal transformation matrix whose columns are eigenvectors associated with the parameters of the line. Usually, this matrix is achieved through numerical methods which does not allow the achievement of an analytical model for line developed directly in the phases domain. This work will show the modal transformation matrix of a hypothetical two-phase obtained with numerical and analytical procedures. It will be shown currents and voltage s at terminals of the line taking into account the use of modal transformation matrices obtained by using numerical and analytical procedures. © 2011 IEEE.

Basic issues emerging from recent research on technological behaviour of selected Latin American metalworking plants

Includes bibliography

Steelplant technological development in Latin America: a comparative study of the selection and upgrading of technology in plants in Argentina, Brasil, Colombia, Mexico and Peru

Includes bibliography

Technological transition and the new skills required by the agribusiness sector

Adoption of new technologies throughout the agribusiness chain is necessary to meet the higher food and fuel needs of a growing and wealthier population. However, modern technologies require the development of new skills and changes in working patterns and relationships at all levels of the organization. Companies that invest in technology without investing in human capital development will not reach their full potential. © 2012 International Food and Agribusiness Management Association (IFAMA).